💼 Bond Premium Calculator
Estimate performance and payment bond premium using the banded sliding-scale structure sureties actually use — not contract × 1%.
Most public "calculators" use a flat percentage. Real bond premium is charged in bands: the rate per $1,000 decreases as the contract grows, and surcharges apply for duration, design-build, and extended warranty.
Interactive Calculator
Band breakdown
| Band | Rate / $1,000 | Premium |
|---|---|---|
| First $100,000 | $25.00 | $2,500 |
| Next $400,000 | $15.00 | $6,000 |
| Next $2,000,000 | $10.00 | $15,000 |
| Duration surcharge (18 months, +6 mo at 1%/mo) | $1,410 |
Illustrative standard tier rates: First $100,000 $25; Next $400,000 $15; Next $2,000,000 $10… Maintenance table: $2.5/$2/$1.5 per $1,000 on first three bands.
Illustrative rates only — not a quote. Confirm with your surety bond producer.
How to use this
- Enter your contract amount (or original vs final for closeout adjustment).
- Pick an illustrative tier — Preferred, Class B Standard, or Merit.
- Set duration and warranty months if they differ from defaults.
- Compare the result to a quote from your producer.
Performance and payment bonds are normally priced together — one premium covers both when issued as a package.
Related Resources
- What Construction Bonds Actually Cost — full explanation of bands and surcharges
- How Bond Rate Tables Are Structured — illustrative Class B Standard schedule
- Bond Closeout & Final Premium — when the final amount changes the premium
Numbers on this page and in the calculator are educational examples, not a quote. Your surety sets your actual rates.