Calculators
Construction calculators that show their math
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Free masonry and concrete block calculators where every constant is cited to a named standard, showing material estimates for cinder blocks, grout, and mortar.
TrustTheCalcs publishes construction calculators for masonry work with one core principle: every number shows its source. The site provides three calculators for block walls—concrete block fill, cinder block counts, and block mortar—each tracing every constant to a named ASTM, CMHA, or manufacturer datasheet.
Most construction calculators hide their constants, leading to material orders that can be off by ten or twenty times. TrustTheCalcs solves this by displaying citations next to results and showing both methods when credible approaches disagree, rather than blending them into an untraceable figure.
Calculators run in your browser with no account, sign-up, or data storage. The site also publishes reference data on block sizes, weights, and specifications, plus guides explaining masonry calculations and when different mortar types apply.
Pricing model: Free
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TrustTheCalcs traces every constant to a named ASTM, CMHA, or manufacturer datasheet standard, and shows that citation next to the result. However, the site is provided without warranty as preliminary estimates for planning only and should not replace a qualified structural engineer's review for anything load-bearing or code-related.
Published calculators disagree because they use different methods: some rely on industry tables while others use geometric derivation. TrustTheCalcs shows both methods separately rather than blending them, and the difference can be significant—per-block fill volumes on the web range from 0.014 to 0.25 ft³ while the sourced answer is between 0.302 and 0.321 ft³.
No. The calculators are free and require no account or sign-up. They run entirely in your browser and the values you enter never leave your device.
No. TrustTheCalcs is a material-estimating resource for planning only. The tools do not replace engineered drawings or a professional engineer's review. For anything structural or code-related, use the numbers to plan and then confirm the design with a qualified professional.
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