Home / Tools All calculators Twelve calculators, grouped by the job you are doing. Each one shows its formula, works in imperial or metric, and keeps your numbers in the page address so you can send a result to whoever is holding the wheelbarrow.
Soil and beds Work out volumes and bag counts before you get to the garden centre.
No. 01
Cubic feet, cubic yards, liters and how many bags
Open
No. 03
How much mulch a bed needs at the depth you want
Open
No. 10
Dry quarts, gallons, cubic feet and liters per pot
Open
Feeding and soil health Fertilizer rates, compost balance and pH corrections.
No. 02
Turn an N-P-K label into pounds of product for your plot
Open
No. 05
Seed by the pound for a new lawn or for overseeding
Open
No. 06
Check the carbon to nitrogen balance of your pile
Open
No. 11
Limestone needed to raise soil pH, by soil texture
Open
Timing and planning Sowing dates, spacing, watering and what a bed will actually produce.
No. 04
How many plants fit, in square or triangular layout
Open
No. 07
Gallons or liters per week, adjusted for rainfall
Open
No. 08
Sow, transplant and direct-sow dates from your frost date
Open
No. 09
Fill a grid crop by crop and print the plan
Open
No. 12
A realistic harvest range for what you have planted
Open
SoilSums
Gardening calculators and plain-English growing guides, written and checked by Muzamil Ali. Every result is an estimate — your own soil test and local extension service always win.
hello@soilsums.com
© 2026–2026 SoilSums. All rights reserved.