Free for your class

Checks, lessons and handouts

Send students to these links, or print the PDFs for the classroom.

Embed the free check

Put the free 10-question check on your own page. Copy the code under an exam and paste it into the HTML of your page. Scores open in a new tab on Bid Bond, and the code includes a link back to us. Paste both lines; if your site strips scripts, the frame keeps a fixed height.

• NASCLA Commercial General Building

  Embed code<iframe src="https://bidbondprep.vercel.app/nascla-cgb/diagnostic?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=check_embed&utm_content=nascla-cgb" id="ek-check-nascla-cgb" title="Free NASCLA Commercial practice check" width="100%" height="900" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-check-nascla-cgb"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/nascla-cgb?utm_source=embed&utm_medium=referral&utm_campaign=check_embed&utm_content=nascla-cgb">Free NASCLA Commercial practice check by Bid Bond</a></p>

Embed the question of the day

A new practice question appears in the frame each day on its own. Paste both lines; if your site strips scripts, the frame keeps a fixed height. Or add the RSS feed to a Teams or Slack channel or a reader: no email, nothing sent.

• NASCLA Commercial General Building

  Embed code<iframe src="https://bidbondprep.vercel.app/nascla-cgb/daily?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=daily_embed&utm_content=daily-nascla-cgb" id="ek-daily-nascla-cgb" title="NASCLA Commercial question of the day" width="100%" height="560" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-daily-nascla-cgb"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/nascla-cgb/daily?utm_source=embed&utm_medium=referral&utm_campaign=daily_embed&utm_content=daily-nascla-cgb">NASCLA Commercial question of the day by Bid Bond</a></p>RSS feed URL

Embed the flashcards

The free deck for your class page: students flip the cards in place, and a link under the cards opens the free 10-question check in a new tab. Paste both lines; if your site strips scripts, the frame keeps a fixed height.

• NASCLA Commercial General Building

  Embed code<iframe src="https://bidbondprep.vercel.app/nascla-cgb/flashcards?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=flashcards_embed&utm_content=flashcards-embed" id="ek-flashcards-nascla-cgb" title="Free NASCLA Commercial flashcards" width="100%" height="640" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-flashcards-nascla-cgb"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/nascla-cgb/flashcards?utm_source=embed&utm_medium=referral&utm_campaign=flashcards_embed&utm_content=flashcards-embed">Free NASCLA Commercial flashcards by Bid Bond</a></p>

Tools to embed

Copy the code under a tool and paste it into the HTML of your page. The tool runs inside a frame on your page, and the code includes a link back to us. Or just link to the tool.

• NASCLA study plan builder: week-by-week schedule

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/nascla-study-plan?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=nascla-study-plan" id="ek-tool-nascla-study-plan" title="NASCLA study plan builder: week-by-week schedule" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-nascla-study-plan"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/nascla-study-plan?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=nascla-study-plan">NASCLA study plan builder: week-by-week schedule by Bid Bond</a></p>

• Free NASCLA flashcards: 40 cards, no signup

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/nascla-flashcards?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=nascla-flashcards" id="ek-tool-nascla-flashcards" title="Free NASCLA flashcards: 40 cards, no signup" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-nascla-flashcards"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/nascla-flashcards?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=nascla-flashcards">Free NASCLA flashcards: 40 cards, no signup by Bid Bond</a></p>

• NASCLA reference finder: which book to open

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/nascla-reference-finder?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=nascla-reference-finder" id="ek-tool-nascla-reference-finder" title="NASCLA reference finder: which book to open" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-nascla-reference-finder"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/nascla-reference-finder?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=nascla-reference-finder">NASCLA reference finder: which book to open by Bid Bond</a></p>

• NASCLA plan-reading drill: three practice sheets

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/nascla-plan-reading-drill?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=nascla-plan-reading-drill" id="ek-tool-nascla-plan-reading-drill" title="NASCLA plan-reading drill: three practice sheets" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-nascla-plan-reading-drill"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/nascla-plan-reading-drill?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=nascla-plan-reading-drill">NASCLA plan-reading drill: three practice sheets by Bid Bond</a></p>

• NASCLA plan-reading drill 2: three more sheets

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/nascla-plan-reading-drill-2?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=nascla-plan-reading-drill-2" id="ek-tool-nascla-plan-reading-drill-2" title="NASCLA plan-reading drill 2: three more sheets" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-nascla-plan-reading-drill-2"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/nascla-plan-reading-drill-2?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=nascla-plan-reading-drill-2">NASCLA plan-reading drill 2: three more sheets by Bid Bond</a></p>

• NASCLA plan-reading drill 3: section, site, power

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/nascla-plan-reading-drill-3?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=nascla-plan-reading-drill-3" id="ek-tool-nascla-plan-reading-drill-3" title="NASCLA plan-reading drill 3: section, site, power" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-nascla-plan-reading-drill-3"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/nascla-plan-reading-drill-3?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=nascla-plan-reading-drill-3">NASCLA plan-reading drill 3: section, site, power by Bid Bond</a></p>

• Markup and margin calculator for contractor bids

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/markup-margin-calculator?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=markup-margin-calculator" id="ek-tool-markup-margin-calculator" title="Markup and margin calculator for contractor bids" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-markup-margin-calculator"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/markup-margin-calculator?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=markup-margin-calculator">Markup and margin calculator for contractor bids by Bid Bond</a></p>

• Concrete yardage calculator for slabs and footings

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/concrete-yardage-calculator?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=concrete-yardage-calculator" id="ek-tool-concrete-yardage-calculator" title="Concrete yardage calculator for slabs and footings" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-concrete-yardage-calculator"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/concrete-yardage-calculator?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=concrete-yardage-calculator">Concrete yardage calculator for slabs and footings by Bid Bond</a></p>

• CMU block calculator: blocks for a wall

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/cmu-block-calculator?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=cmu-block-calculator" id="ek-tool-cmu-block-calculator" title="CMU block calculator: blocks for a wall" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-cmu-block-calculator"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/cmu-block-calculator?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=cmu-block-calculator">CMU block calculator: blocks for a wall by Bid Bond</a></p>

• Roofing squares calculator with pitch factor

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/roofing-squares-calculator?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=roofing-squares-calculator" id="ek-tool-roofing-squares-calculator" title="Roofing squares calculator with pitch factor" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-roofing-squares-calculator"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/roofing-squares-calculator?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=roofing-squares-calculator">Roofing squares calculator with pitch factor by Bid Bond</a></p>

• Retainage calculator for progress billing

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/retainage-calculator?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=retainage-calculator" id="ek-tool-retainage-calculator" title="Retainage calculator for progress billing" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-retainage-calculator"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/retainage-calculator?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=retainage-calculator">Retainage calculator for progress billing by Bid Bond</a></p>

• Board feet calculator for lumber takeoffs

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/board-feet-calculator?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=board-feet-calculator" id="ek-tool-board-feet-calculator" title="Board feet calculator for lumber takeoffs" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-board-feet-calculator"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/board-feet-calculator?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=board-feet-calculator">Board feet calculator for lumber takeoffs by Bid Bond</a></p>

• Cut and fill calculator: average end area method

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/cut-and-fill-calculator?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=cut-and-fill-calculator" id="ek-tool-cut-and-fill-calculator" title="Cut and fill calculator: average end area method" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-cut-and-fill-calculator"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/cut-and-fill-calculator?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=cut-and-fill-calculator">Cut and fill calculator: average end area method by Bid Bond</a></p>

• CPM float calculator: critical path, total and free float

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/cpm-float-calculator?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=cpm-float-calculator" id="ek-tool-cpm-float-calculator" title="CPM float calculator: critical path, total and free float" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-cpm-float-calculator"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/cpm-float-calculator?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=cpm-float-calculator">CPM float calculator: critical path, total and free float by Bid Bond</a></p>

• Break-even calculator for contractors

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/break-even-calculator?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=break-even-calculator" id="ek-tool-break-even-calculator" title="Break-even calculator for contractors" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-break-even-calculator"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/break-even-calculator?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=break-even-calculator">Break-even calculator for contractors by Bid Bond</a></p>

• Drywall sheet calculator for walls and ceilings

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/drywall-sheet-calculator?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=drywall-sheet-calculator" id="ek-tool-drywall-sheet-calculator" title="Drywall sheet calculator for walls and ceilings" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-drywall-sheet-calculator"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/drywall-sheet-calculator?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=drywall-sheet-calculator">Drywall sheet calculator for walls and ceilings by Bid Bond</a></p>

• Overhead rate calculator for contractors

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/overhead-rate-calculator?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=overhead-rate-calculator" id="ek-tool-overhead-rate-calculator" title="Overhead rate calculator for contractors" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-overhead-rate-calculator"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/overhead-rate-calculator?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=overhead-rate-calculator">Overhead rate calculator for contractors by Bid Bond</a></p>

• Over and under billing calculator (WIP)

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/over-under-billing-calculator?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=over-under-billing-calculator" id="ek-tool-over-under-billing-calculator" title="Over and under billing calculator (WIP)" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-over-under-billing-calculator"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/over-under-billing-calculator?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=over-under-billing-calculator">Over and under billing calculator (WIP) by Bid Bond</a></p>

• Bonding capacity estimator for contractors

  Open the tool

  Embed code<iframe src="https://bidbondprep.vercel.app/tools/bonding-capacity-estimator?embed=1&utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=bonding-capacity-estimator" id="ek-tool-bonding-capacity-estimator" title="Bonding capacity estimator for contractors" width="100%" height="1500" loading="lazy" style="border:0"></iframe><script>addEventListener("message",function(e){var f=document.getElementById("ek-tool-bonding-capacity-estimator"),d=e.data,h=d&&+d.height;if(f&&h>0&&e.source===f.contentWindow&&e.origin==="https://bidbondprep.vercel.app"&&d.type==="ek-embed-height")f.style.height=Math.min(4000,Math.max(300,h))+"px"})</script> <p><a href="https://bidbondprep.vercel.app/tools/bonding-capacity-estimator?utm_source=embed&utm_medium=referral&utm_campaign=tool_embed&utm_content=bonding-capacity-estimator">Bonding capacity estimator for contractors by Bid Bond</a></p>