{"success":true,"version":"v1","request":{"tool":"get_calculator_schema","calculator_id":"mrr-growth"},"result":{"entity_type":"calculator","id":"mrr-growth","calculator_id":"mrr-growth","canonical_url":"https://tttkmbb.com/business/mrr-growth","name":"MRR Growth Calculator","title":"MRR Growth Calculator – Monthly Recurring Revenue Projection, ARR and Annualised Growth Rate","category":"business","category_name":"Business & Marketing","tool_name":"predict_mrr_growth","featured_mcp_tool":false,"description":"Projects monthly recurring revenue after n months of compound growth from a starting MRR and a monthly growth rate (given directly or derived from new, expansion and churned MRR), and reports the resulting ARR, total growth, the equivalent annual growth rate and the doubling time.","use_when":"You run a subscription business and want to see where MRR lands after a number of months at the current growth rate, or convert a monthly rate into an annual one.","do_not_use_when":"Growth is in absolute amounts rather than a percentage each month (use a linear projection), or you need customer-count churn (use churn-rate) or unit economics (use cac-ltv).","inputs":[{"name":"starting_mrr","label":"Starting MRR","type":"number","required":true,"min":0,"max":1000000000000,"description":"Current monthly recurring revenue.","example":10000},{"name":"monthly_growth_percent","label":"Monthly growth rate","type":"number","unit":"%","required":false,"min":-100,"max":1000,"description":"Net MRR growth per month in percent. If omitted, it is derived from new_mrr + expansion_mrr − churned_mrr relative to starting_mrr.","example":5},{"name":"new_mrr","label":"New MRR per month","type":"number","required":false,"min":0,"max":1000000000000,"description":"MRR added from new customers in a typical month (used when monthly_growth_percent is omitted).","example":600},{"name":"expansion_mrr","label":"Expansion MRR per month","type":"number","required":false,"min":0,"max":1000000000000,"description":"MRR added from upgrades of existing customers.","example":200},{"name":"churned_mrr","label":"Churned + contraction MRR per month","type":"number","required":false,"min":0,"max":1000000000000,"description":"MRR lost from cancellations and downgrades.","example":300},{"name":"months","label":"Months to project","type":"integer","unit":"months","required":false,"default":12,"min":1,"max":600,"description":"Projection horizon.","example":12}],"outputs":[{"name":"monthly_growth_rate_percent","label":"Monthly growth rate","type":"number","unit":"%","decimals":2,"description":"Rate used for the projection."},{"name":"net_new_mrr_first_month","label":"Net new MRR (first month)","type":"number","decimals":2,"description":"starting_mrr × growth rate (or new + expansion − churned)."},{"name":"mrr_after","label":"MRR after n months","type":"number","decimals":2,"description":"starting_mrr × (1 + g)^months."},{"name":"arr_after","label":"ARR after n months","type":"number","decimals":2,"description":"mrr_after × 12."},{"name":"total_growth_percent","label":"Total growth over the period","type":"number","unit":"%","decimals":2,"description":"((1 + g)^months − 1) × 100."},{"name":"annualized_growth_percent","label":"Annualised growth rate","type":"number","unit":"%","decimals":2,"description":"((1 + g)^12 − 1) × 100: the CAGR equivalent of the monthly rate."},{"name":"months_to_double","label":"Months to double","type":"number","unit":"months","decimals":2,"description":"ln 2 / ln(1 + g) (only when g > 0)."}],"input_schema":{"type":"object","properties":{"starting_mrr":{"description":"Current monthly recurring revenue.","type":"number","minimum":0,"maximum":1000000000000,"examples":[10000]},"monthly_growth_percent":{"description":"Net MRR growth per month in percent. If omitted, it is derived from new_mrr + expansion_mrr − churned_mrr relative to starting_mrr. Unit: %.","type":"number","minimum":-100,"maximum":1000,"examples":[5],"x-unit":"%"},"new_mrr":{"description":"MRR added from new customers in a typical month (used when monthly_growth_percent is omitted).","type":"number","minimum":0,"maximum":1000000000000,"examples":[600]},"expansion_mrr":{"description":"MRR added from upgrades of existing customers.","type":"number","minimum":0,"maximum":1000000000000,"examples":[200]},"churned_mrr":{"description":"MRR lost from cancellations and downgrades.","type":"number","minimum":0,"maximum":1000000000000,"examples":[300]},"months":{"description":"Projection horizon. Unit: months.","type":"integer","minimum":1,"maximum":600,"default":12,"examples":[12],"x-unit":"months"}},"additionalProperties":false,"required":["starting_mrr"]},"output_schema":{"type":"object","properties":{"monthly_growth_rate_percent":{"description":"Rate used for the projection. Unit: %.","type":"number","x-unit":"%"},"net_new_mrr_first_month":{"description":"starting_mrr × growth rate (or new + expansion − churned).","type":"number"},"mrr_after":{"description":"starting_mrr × (1 + g)^months.","type":"number"},"arr_after":{"description":"mrr_after × 12.","type":"number"},"total_growth_percent":{"description":"((1 + g)^months − 1) × 100. Unit: %.","type":"number","x-unit":"%"},"annualized_growth_percent":{"description":"((1 + g)^12 − 1) × 100: the CAGR equivalent of the monthly rate. Unit: %.","type":"number","x-unit":"%"},"months_to_double":{"description":"ln 2 / ln(1 + g) (only when g > 0). Unit: months.","type":"number","x-unit":"months"}}},"formula":"g = monthly_growth_percent/100 or (new_mrr + expansion_mrr − churned_mrr) / starting_mrr; MRR_n = starting_mrr × (1 + g)^months; ARR = 12 × MRR_n; annualised = (1 + g)^12 − 1; months_to_double = ln 2 / ln(1 + g)","method":"Compound projection at a constant monthly rate; when the rate is derived from MRR components, the same percentage (not the same currency amount) is assumed for every month.","sources":[{"name":"Wikipedia – Compound annual growth rate","url":"https://en.wikipedia.org/wiki/Compound_annual_growth_rate","type":"reference","retrieved_at":"2026-09-24"},{"name":"Andreessen Horowitz – 16 Startup Metrics","url":"https://a16z.com/16-startup-metrics/","type":"reference","retrieved_at":"2026-09-24"}],"freshness":{"type":"static","max_age_seconds":null,"note":"Deterministic formula with fixed constants; results never go stale. Inputs supplied by the caller determine the output."},"examples":[{"name":"10,000 MRR at 5 %/month for 12 months","inputs":{"starting_mrr":10000,"monthly_growth_percent":5,"months":12},"expected":{"monthly_growth_rate_percent":5,"net_new_mrr_first_month":500,"mrr_after":17958.56,"arr_after":215502.76,"total_growth_percent":79.59,"annualized_growth_percent":79.59,"months_to_double":14.21},"url":"https://tttkmbb.com/api/v1/calculate/mrr-growth?starting_mrr=10000&monthly_growth_percent=5&months=12"},{"name":"20,000 MRR, +1,500 new, +500 expansion, −800 churned, 6 months","inputs":{"starting_mrr":20000,"new_mrr":1500,"expansion_mrr":500,"churned_mrr":800,"months":6},"expected":{"monthly_growth_rate_percent":6,"net_new_mrr_first_month":1200,"mrr_after":28370.38,"arr_after":340444.59,"total_growth_percent":41.85,"annualized_growth_percent":101.22},"url":"https://tttkmbb.com/api/v1/calculate/mrr-growth?starting_mrr=20000&new_mrr=1500&expansion_mrr=500&churned_mrr=800&months=6"}],"faq":[{"q":"Why is 5 % monthly not 60 % yearly?","a":"Growth compounds: 1.05^12 = 1.796, so 5 % per month is 79.6 % per year. The often-quoted 'T2D3' path corresponds to roughly 10 % monthly growth in the early years."},{"q":"What is net new MRR?","a":"New MRR from new customers plus expansion MRR from upgrades minus churned and contraction MRR. Divided by starting MRR it gives the net monthly growth rate used here."}],"tags":["mrr calculator","mrr growth","arr calculator","saas growth rate","monthly recurring revenue projection"],"related":[{"calculator_id":"cagr","reason":"Annual growth rate between two values."},{"calculator_id":"churn-rate","reason":"Customer-count churn behind churned MRR."},{"calculator_id":"compound-interest","reason":"Same compounding arithmetic for money."}],"links":{"html":"https://tttkmbb.com/business/mrr-growth","markdown":"https://tttkmbb.com/business/mrr-growth.md","json":"https://tttkmbb.com/business/mrr-growth.json","api":"https://tttkmbb.com/api/v1/calculate/mrr-growth","schema":"https://tttkmbb.com/api/v1/calculators/mrr-growth","openapi":"https://tttkmbb.com/openapi.json","mcp":"https://tttkmbb.com/mcp"},"version":"v1","updated_at":"2026-09-24"},"timestamp":"2026-09-24T01:48:54Z","next_actions":[{"tool":"run_calculator","calculator_id":"mrr-growth","reason":"Run MRR Growth Calculator with the inputs above."}],"links":{"markdown":"https://tttkmbb.com/business/mrr-growth.md"}}