IRONGRID
Free Tools

Contractor Calculators

Free calculators for the metrics that matter most in a contracting business. Calculate gross margin, labor cost, utilization, job variance, KPI health score, and break-even billing rate in seconds.

Gross Profit Margin Calculator

Enter revenue, labor cost, and materials cost to calculate your gross margin and compare it to the 40–55% range healthy contractors target.

(Revenue − Labor − Materials) / Revenue × 100
40–55% healthyOpen calculator

Labor Cost Percentage Calculator

Calculate what percentage of your revenue goes to labor. The 25–35% range is where most successful contractors operate.

Total Labor Cost / Total Revenue × 100
25–35% healthyOpen calculator

Technician Utilization Rate Calculator

Find out what share of your team's paid hours are generating billable revenue. Low utilization is often the fastest profitability leak to fix.

Billable Hours / Total Paid Hours × 100
70–85% healthyOpen calculator

Markup vs. Margin Converter

Convert markup to margin or margin to markup. See the exact markup needed to hit your target gross margin, and why 50% markup is not 50% margin.

Margin = Markup / (100 + Markup) × 100
67–122% markup for 40–55% marginOpen calculator

Job Cost Variance Analyzer

Compare estimated vs. actual labor, materials, and revenue on any job. See exactly where costs ran over or under and how much gross profit you gained or lost versus the bid.

Variance = Estimated Cost - Actual Cost by Category
Within 5-10% variance is healthyOpen calculator

Contractor KPI Health Score

Enter up to 8 key metrics and get an overall 0-to-100 business health score, plus category-level scores for profitability, labor efficiency, billing performance, and client performance.

Weighted score across 4 business categories
70 or above is healthyOpen calculator

Break-Even and Billable Rate Calculator

Enter monthly overhead, technician count, hours, utilization, and burdened labor cost to find the hourly billing rate that covers all costs and hits your target profit margin.

Break-Even Rate = Total Monthly Costs / Billable Hours
Know your floor before setting pricesOpen calculator

Know your numbers before end of year

Most contractors discover margin problems at year-end, when there is little opportunity to course-correct. These calculators let you run the numbers on any job, any period, or any pricing scenario without waiting for your accountant.

For a complete guide to the KPIs behind these calculations, including benchmark ranges and how to track them consistently, see the contractor KPI guide and glossary below.

Contractor KPI GuideContractor GlossaryJob Costing SoftwareContractor Invoicing SoftwareField Service SchedulingLabor Burden Rate Guide

Capture the data automatically

IRONGRID tracks labor hours, materials, and invoice status on every job, so the numbers behind these calculators are already there when you need them.

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